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Published Apr 09, 2014 | Updated Sep 15, 2017

JS/Fiexp

Severe |Detected with Windows Defender Antivirus

Aliases: No associated aliases

Summary

Microsoft security software detects and removes this family of threats.

This is a family of JavaScript components belonging to an exploit kit called Fiesta. Similar to other exploit kits, such as Blacole, it first checks your browser, version, and installed plugins. It does this to determine which exploit to use on your PC.

Malware in this family can exploit vulnerabilities in Java, Adobe Flash Player, Adobe Acrobat Reader, Microsoft Silverlight, and Internet Explorer.

They can run on your PC when you visit a hacked or malicious website.

Find out ways that malware can get on your PC.  

The following free Microsoft software detects and removes this threat:

Even if we've already detected and removed this particular threat, running a full scan might find other malware that is hiding on your PC.

You can also visit the Microsoft virus and malware community for more help.

If you’re using Windows XP, see our Windows XP end of support page.

Update Java, Adobe Acrobat and Reader, and Adobe Flash Player

Make sure you install all available updates. You can read more about these vulnerabilities and download software updates from these links:

You should remove older versions of Java, as keeping old and unsupported versions of Java on your PC is a serious security risk:

If you continue to get alerted about this threat, deleting your temporary Java files can help:

It's also important to keep your other software up to date:

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